Ventilation fan



FIG. 1 is a top perspective view of a ventilation fan;

FIG. 2 is a top view of a ventilation fan of FIG. 1;

FIG. 3 is a front side view of a ventilation fan of FIG. 1;

FIG. 4 is a side view of a ventilation fan of FIG. 1; and,

FIG. 5 is a bottom view of a ventilation fan of FIG. 1.

The features shown in broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM We claim the ornamental design for a ventilation fan, as shown and described. 